Valve-packing.



No. 887,405. PATENTED MAY 12, 1908. F. LOEDIGE. VALVE PACKING.

APPLICATION FILED r312. 25, 1908.

' [warzirv fieczerz'cfijl oeazzje FREDERICK LOEDIG'E, OF CHICAGO, ILLINOIS.

VALVE-PACKING.

Specification of Letters Patent.

Patented May 12, 1908.

Application filed February 25, 1908. Serial No. 417,686.

To all whom it may concern:

Be it known that I, FREDERICK Lonnren, a citizen of the United States, residing at 93 Orchard street, Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Valve-Packing, of which the following is a specification.

My invention relates to an improved eonstruction of metal packing for the piston of a valve, which shall render it durably effective in reventing leakage past the piston of the fluid-pressure controlled by the valve.

WVhile my improvement is adaptable to the pistons of valves of various kinds for dill'erent purposes, I have more especially devised it for use on a locomotive-engine throttlevalve and therefore, though without intending to limit it thereto, describe it in that particular connection, in which it is illustrated in the accompanying drawing, showing, by a broken view, a longitudinal section of the device. I

In the rear head 1 of a boiler 2 is seated, at an opening 3, a metal stufiing-box 4 projecting into the boiler and flanged at 5 on its outer edge. The valve-stem 6 extends centrally through the stuffing-box in which is confined about it a sleeve 7 of brass or other metal relatively harder than the metal of which the packing 8, hereinafter described, is composed. The outer end of the bushing 7 is formed into an inwardly tapering packing seat 9. The packing 8 is an annular head or general cone-trustum shape with its tapered section tapering to an angle more acute than that of the seat 9, to bear at its inner end against the latter at a considerable depth therein, substantially as represented, while toward the outer end of the packing-head its tapering section finds bearing about the outer edge of the mouth of the stul'fing-box, thus having two bearing-points at and from which to exert its packing function. The interior ofthe packing is chambered out, as shown at 10, to reduce the friction against the valvestem, as one purpose, and for the further purpose of weakening it about its inner and outer ends so that, being formed of metal relatively softer than that of the bushing, it will yield under the force of the fluid-pressure against the inner end of the bushing, to hug closely about the valve-stem at the opposite ends of the chamber 10. The metal I prefer to use for the acking-head, which describes a circle of un' orm diameter about its outerend portion, is a composition consisting of tin and Babbitt metal, in the proportions of about three parts of each to two parts of lead. A metal washer 1.1, preferably of brass and shown to be concave on its inner face, surrounds the stem and is confined at its concave face against the outer end of the packing-head by the gland 12, which is secured in place by the nuts 13 on the threaded ends of the studs 14 extending from the head 1 through the Ilange on the stull'mg-box and a llange 15 on gland.

Fluid-pressure in the boiler exerted against the bushing 7 lorces its seat against the seating-end of the head 8, thereby compressing the weakened inner end of the latter about the valve-stem to prevent leakage at that point, while the pressure, acting in opposition to the confinement by the gland of the packing-head against the mouth oi the stuffmg-box, beddingly compresses the softer metal of the head against the same and thus prevents leakage of pressure about the bushing at that )oint.

What I claim as new and desire to secure by Letters Patent is- 1. In combination with a valve-stem, a springless packing therelor comprising a stuffing-box through which the stem passes, containing a metal bushing having an iiiwardly-tapering packing-seat in its outer end, and an annular metal tapering packinghead confined about the stem to bear at its narrower inner end against said seat and toward its outer end against the mouth of the stufling-box.

2. In combination with a valve-stem, a stufling-box through which the stem passes, containing a metal bushing having an inwardly-tapering )acking-seat in its outer end, and an annu ar tapering packing-head of metal relatively softer than that of said bushing, confined about the stem to bear at its narrower inner end against said seat and toward its outer end against the mouth of the stuffing-box.

3. In combination with a valve-stem, a stul'ling-box through which the stem passes, containing a metal bushing having an in wardly-tapering packing-seat in its outer end, and an annular tapering chambered packing-head of metal relatively softer than that of said bushing confined about the stem to bear at its narrower inner end against said seat and toward its outer end againstthe mouth of the stullingbox.

4. In combination with the rear head of a boiler, athrottle-valve stem Working through toWard its outer end against the mouth of 10 the said head and a stuffing-box extending the stuffing-box, a Washer on the outer end through said head and through which said of said packing-head, and a gland secured stem passes, a metal bushing in the stufiingon said head to bear against the Washer.

box havin an inwardly-tapering packingseat in its buter end, an annular chambered 5 FREDERICK LOEDIGE' tapering packing-head of metal relatively In presence of softer than that of said bushing, bearing at l A. U. THORIEN,

its narrower inner end against said seat and 1 RALPH SCHAEFER. 

